<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>12</title>
    <style>
        .c1{
            height: 300px;
            width: 500px;
            border: 1px solid red;
            margin: 100px;
        }
        .c1 .c2{
            height: 59px;
            width: 59px;
            background-color: green;
            position: absolute;

            right: 0;
            /*top: 0;*/
            bottom: 0;
        }
    </style>
</head>
<body>
<div class="c1" style="position: relative;">
    <div class="c2"></div>
    <div class="c2"></div>
    <div class="c2"></div>
</div>

</body>
</html>